updating to 4.0

New design with breaking changes, gulp 4, all dependencies updated, dev environment changed, and many more changes

scss/navs/fixed.scss

@@ -0,0 +1,8 @@
+// Fixed Nav Option
+// Add .fixed-top class to top .navbar-nav and to .sidebar - add .fixed-nav to body
+
+.sidebar.fixed-top {
+  // top: $navbar-base-height;
+  // height: calc(100vh - #{$navbar-base-height});
+  // overflow-y: auto;
+}